already set multi_notify modparam.

In four nodes case, ka.ns.com is not resolve to four ip at once.
ka.ns.com resolve to ip1 in first visit, and resolve to ip2 in second visit, and so on.
This is DNS action. not kamailio.
Maybe it is not a general usage, DNS should resolve to all four ip.

I realized my problem, DNS should resolve to all four ip.
Thanks.

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